Large BGE Wagon/Cart

I'll start with a little back story first, i'm a former XL BGE owner but we sold it due to the hastle of rolling it on and off our apartment porch and into the grass. Recently we decided enough is enough and we can't continue to go without a BGE in our life.

So i'm buying myself a Large egg for my birthday this month. Now i'm using the next few weeks to build/design a portable wagon/cart. I want it to have pneumatic tires that will roll across soft grass with ease. 

Here's what I have so far (I bought a used nest on craigslist for parts) i'm in the process of welding all the joints together on the nest and the cutting the legs off (see picture) to make basically a table nest with extended arms to keep the egg from bouncing in transport.


For the transport vehicle, i think i've narrowed it down to the garden wagon pictured below from tractor supply co. 


So now I come here looking for help on ideas and pointers from the experienced eggheads on here. Looking for any pointers/ideas from past experience anyone might have had in a similar situation. i plan on eventually adding a rack to hold an RTIC cooler on the back and a charcoal/tool storage rack on the from half of the wagon (the overall length of the wagon is 52", so I think i'll have the room for everything i've got planned).

Thanks in advance for the input and help!!!!